JP2002053323A - Glass product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reutilize grinding slurry generated by cutting/grinding optical glass. SOLUTION: Chips generated when molded goods of the optical glass used for a general lens except optical fiber are subjected to cutting/grinding processing and glass powder obtained by drying suspension of grinding slurry containing an abrasive are melted and are molded to a prescribed form. Otherwise, after the grinding slurry is dried to obtain glass powder, fine glass scrap pulverized to a size of several cm or below is added to the glass powder till 5 to 40 wt.% of a final product and the mixture is melted and is molded to a prescribed form to obtain a transparent or opaque or colored glass product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass product obtained by regenerating and melting a cutting / polishing waste of optical glass which is almost all disposed of at present.

[0002]

2. Description of the Related Art In recent years, with the development of optical technology industries such as electronic cameras and video cameras in addition to photographic devices, the need for consuming optical lenses has increased. In particular, there has been a problem in the treatment of industrial waste of polishing slurries containing abrasives generated in large quantities by the glass cutting / polishing process when processing general optical lenses other than optical fibers. These optical glasses contain inorganic compounds of heavy metals such as lead, and the polishing slurries contain abrasives, which cannot be disposed of as they are and are usually buried in managed landfills. Have been. Therefore, the processing cost has increased. On the other hand, there is a need in the industry for methods and solutions for disposing of industrial waste. Optical glass manufacturers have demanded that these polishing slurries be reused, but there has been no suitable recycling method.

[0003]

As described above, it is necessary not to discard the polishing slurry generated by the cutting and polishing work of the optical glass which has been conventionally discarded as industrial waste. An object of the present invention is to provide a glass product in which a polishing slurry of an optical glass of a general lens other than an optical fiber lens is reused. Another object of the present invention is to solve the above-mentioned problems at the same time, and to provide a glass product by recycling a polishing slurry of waste optical glass.

[0004]

The present invention has the following arrangement to achieve the above object. Cutting and cutting of optical glass moldings used for general lenses excluding optical fibers
A glass product formed by drying a suspension of a polishing slurry containing cuttings and abrasives generated during polishing and melting a glass powder obtained to form a predetermined shape.

Another object of the present invention is to provide a method for drying a polishing slurry containing chips and abrasives generated during cutting and polishing of a molded article of optical glass used for a general lens other than an optical fiber. Fine glass chips crushed to a size of several cm or less are added to the glass powder so as to be 5 to 40% by weight of the final product, melted, and formed into a predetermined shape to form a transparent or opaque glass product. When producing, or melting a mixture of the polishing slurry and the glass cullet cullet, if the final product needs to be colored, use a colored cullet for the cullet and select the type of the colored cullet. This can be achieved by an arrangement for producing glassware having a desired coloring.

In producing the glass product of the present invention, a mixture obtained by mixing a predetermined amount of colored glass cullet with a polishing slurry of optical glass cutting chips and polishing chips other than optical fibers is used in an electric melting furnace. The melting temperature within the range of 1250 to 1500 ° C. is appropriate. l
The softening point at og η = 7.6 is 727 ° C. or the annealing point (l
og η = 13.0) is 585 ° C., and a recycled glass product of a mixture of the polishing slurry and the glass cullet can be produced by a general melting furnace such as a gas melting furnace or an electric melting furnace and a slow cooling furnace.

[0007] The glass product of the present invention is a recycled glass by mixing glass scraps that have been discarded without directly discarding the polishing slurry of optical glass and cullets that are glass scraps of colored glass products. It can be formed into optical glass blocks, plate-like glass and amorphous lump glass which are products. Applications include building interiors and exteriors,
Or outdoor glass blocks, tiles, bricks,
It can be used for decorative members.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the glass product of the present invention shown in the drawings will be described. FIG. 1 is a flow chart of an embodiment of a manufacturing process of a glass product of the present invention. FIG. 2 is a diagram showing the relationship between the temperature and the viscosity of the polishing slurry used for the glass product of the present invention.

The manufacturing process of the glass product of the present invention will be described with reference to FIG. First, a polishing slurry containing cutting and polishing glass chips and an abrasive material generated in a manufacturing process of cutting and polishing of optical glass of a general lens is heat-treated, and colorless glass chips or A raw material preparation step A for mixing cullets of colored glass, and the mixture mixed in the raw material preparation step A is heated and melted at 1500 ° C. or higher in an electric melting furnace (melting step B).

The molten mixture is poured into a mold or a frame mold and molded into a predetermined shape (molding step C). For example,
It is formed into a plate and used for paperweight. Heavy metals that may contaminate the environment can be contained in the glass product by the melting and molding. The formed recycled glass is processed into a shape according to the application (processing step D). For example,
Tile. In order to gradually cool the glass product in the slow cooling step E and obtain a final product, the glass product is visually inspected or inspected by another inspection device in the inspection step F, and packed and shipped (packing step G).

FIG. 2 shows a temperature-viscosity characteristic curve of the mixture of one embodiment in a molten state of polishing slurry and cullet generated during processing of optical glass. As shown in this figure, it can be seen that the viscosity of the glass mixture decreases as the heating melting temperature increases.

EXAMPLE A polishing slurry generated in an optical glass cutting / polishing step is heated and dried, melted, and formed into a predetermined mold according to the application. These glass raw materials are mixed with scraps of transparent glass such as window glass or cullet waste of colored glass such as general beer bottles and wine bottles at an arbitrary ratio with the polishing slurry, and are mixed at 1450 ° C. in an electric melting furnace. And melted, poured into a mold and molded into a predetermined mold.
For example, it is formed into a sheet glass by a roller rolling machine or the like.

Since there are various types of polishing slurries depending on the type of optical glass, a slurry which can be used as a glass product by changing the mixing ratio of cullet according to the components of the polishing slurry is obtained. For example, in the case of a polishing slurry having the following composition as the polishing slurry, the cullet and the abrasive were mixed with the cullet shown in Tables 1 and 2 and used as a product.

Polishing slurry A Polishing slurry B2O3 11.0-16.0 33.0 SiO2 28.0-38.0 5.0 La2O3 11.0-14.0 32.0 Al2O3 0.8-3.50 0.7 CaO 1.0 to 4.0 2.6 SrO 0.8 to 7.7-BaO 5.0 to 9.0 14.0 ZnO 0.2 to 3.0 8.5 Na2O 0.4 to 3 0.0 0.8 KO 0.3 to 4.5 1.0 The composition of the polishing slurries A and B is not limited to these, but there is also a polishing slurry of a mixed composition of these.

[0015]

[Table 1]

According to Table 1, the polishing slurry A was 80 to 92%.
Parts, not more than 8 to 20 parts of cullet, and 0 to 1 part of abrasive material, complete revitrification could be achieved at a preferable mixing ratio.

[0017]

[Table 2]

As shown in Table 2, in the case of the composition of the polishing slurry B, 60 to 80 parts of the polishing slurry,
20 to 40 parts of cullet, vitrification was possible by 0 parts of abrasive,

Table 3 shows the measurement results of the liquidus temperature when the reclaimed glass is melted in the electric furnace. From this result, 10
It is necessary to avoid keeping or staying the glass base in a temperature range where a devitrified phase is formed at around 95 to 1100 ° C, but this is a liquid phase temperature range that does not pose a problem in the above-described ordinary melting furnace and molding process. .

[0020]

[Table 3]

[0021]

The glass product of the present invention can be manufactured by regenerating from a polishing slurry of the optical glass of a general lens excluding the optical glass for an optical fiber.
Conventionally, embedded industrial waste can be used without being discarded, so that environmental pollution can be prevented. In addition, since expensive optical glass can be regenerated without being discarded, it can be used as a recycled product.
Further, the glass product can be used safely because there is no concern about elution of heavy metals.

[Brief description of the drawings]

FIG. 1 is a flowchart of an embodiment of a manufacturing process of a glass product of the present invention.

FIG. 2 is a diagram showing a relationship between temperature and viscosity of a polishing slurry used for the glass product of the present invention.

Claims (3)

[Claims] 1. A suspension of a polishing slurry containing swarf and abrasives generated during cutting and polishing of a molded product of optical glass used for a general lens excluding an optical fiber is obtained. A glass product obtained by melting glass powder and forming it into a predetermined shape. 2. A polishing slurry containing cuttings and abrasives generated during cutting and polishing of a molded article of optical glass used for a general lens except for an optical fiber is dried, and then dried for several cm.
Fine glass chips crushed to the following size
A glass product characterized by being added to the glass powder so as to be に な る 40% by weight, melted, and molded into a predetermined shape to produce a transparent or opaque glass product. 3. When melting a mixture of the polishing slurry and the cullet of the glass waste, if coloring is required for the final product, a colored cullet is used as the cullet, and the type of the colored cullet is selected. 2. A glass product having a desired coloring is produced.
Alternatively, the glass product according to claim 2.